<?php
/**
 * Smarty Internal Plugin Compile Assign
 *
 * Compiles the {assign} tag
 *
 * @package    Smarty
 * @subpackage Compiler
 * @author     Uwe Tews
 */

/**
 * Smarty Internal Plugin Compile Assign Class
 *
 * @package    Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Assign extends Smarty_Internal_CompileBase {

	/**
	 * Compiles code for the {assign} tag
	 *
	 * @param array  $args      array with attributes from parser
	 * @param object $compiler  compiler object
	 * @param array  $parameter array with compilation parameter
	 *
	 * @return string compiled code
	 */
	public function compile($args, $compiler, $parameter) {
		// the following must be assigned at runtime because it will be overwritten in Smarty_Internal_Compile_Append
		$this->required_attributes = array('var', 'value');
		$this->shorttag_order = array('var', 'value');
		$this->optional_attributes = array('scope');
		$_nocache = 'null';
		$_scope = Smarty::SCOPE_LOCAL;
		// check and get attributes
		$_attr = $this->getAttributes($compiler, $args);
		// nocache ?
		if ($compiler->tag_nocache || $compiler->nocache)
		{
			$_nocache = 'true';
			// create nocache var to make it know for further compiling
			if (isset($compiler->template->tpl_vars[trim($_attr['var'], "'")]))
			{
				$compiler->template->tpl_vars[trim($_attr['var'], "'")]->nocache = true;
			}
			else
			{
				$compiler->template->tpl_vars[trim($_attr['var'], "'")] = new Smarty_variable(null, true);
			}
		}
		// scope setup
		if (isset($_attr['scope']))
		{
			$_attr['scope'] = trim($_attr['scope'], "'\"");
			if ($_attr['scope'] == 'parent')
			{
				$_scope = Smarty::SCOPE_PARENT;
			}
			elseif ($_attr['scope'] == 'root')
			{
				$_scope = Smarty::SCOPE_ROOT;
			}
			elseif ($_attr['scope'] == 'global')
			{
				$_scope = Smarty::SCOPE_GLOBAL;
			}
			else
			{
				$compiler->trigger_template_error('illegal value for "scope" attribute', $compiler->lex->taglineno);
			}
		}
		// compiled output
		if (isset($parameter['smarty_internal_index']))
		{
			$output = "<?php \$_smarty_tpl->createLocalArrayVariable($_attr[var], $_nocache, $_scope);\n\$_smarty_tpl->tpl_vars[$_attr[var]]->value$parameter[smarty_internal_index] = $_attr[value];";
		}
		else
		{
			// implement Smarty2's behaviour of variables assigned by reference
			if ($compiler->template->smarty instanceof SmartyBC)
			{
				$output = "<?php if (isset(\$_smarty_tpl->tpl_vars[$_attr[var]])) {\$_smarty_tpl->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";
				$output .= "\n\$_smarty_tpl->tpl_vars[$_attr[var]]->value = $_attr[value]; \$_smarty_tpl->tpl_vars[$_attr[var]]->nocache = $_nocache; \$_smarty_tpl->tpl_vars[$_attr[var]]->scope = $_scope;";
				$output .= "\n} else \$_smarty_tpl->tpl_vars[$_attr[var]] = new Smarty_variable($_attr[value], $_nocache, $_scope);";
			}
			else
			{
				$output = "<?php \$_smarty_tpl->tpl_vars[$_attr[var]] = new Smarty_variable($_attr[value], $_nocache, $_scope);";
			}
		}
		if ($_scope == Smarty::SCOPE_PARENT)
		{
			$output .= "\nif (\$_smarty_tpl->parent != null) \$_smarty_tpl->parent->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";
		}
		elseif ($_scope == Smarty::SCOPE_ROOT || $_scope == Smarty::SCOPE_GLOBAL)
		{
			$output .= "\n\$_ptr = \$_smarty_tpl->parent; while (\$_ptr != null) {\$_ptr->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]]; \$_ptr = \$_ptr->parent; }";
		}
		if ($_scope == Smarty::SCOPE_GLOBAL)
		{
			$output .= "\nSmarty::\$global_tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";
		}
		$output .= '?>';

		return $output;
	}

}

?>
